如图所示，实线为不知方向的三条电场线，从电场中M点以相同速度垂直于电场线方向飞出a、b两个带电粒子，仅在电场力作用下的运动轨迹如图中虚线
He wants to see changes in the company and I am sure he will, ______. A. on time B. at a time C. at one time D. in time
函数f(x)＝(x－1)ln|x|的图象可能为( )
In June, 2007, a group of students from eight high schools in Winnipeg, the capital of Canada’s Manitoba province, will begin test-launching (试发射) a satellite the size of a Rubik’s cube.
上海市档案馆收藏了一套上海普通市民的家庭账本，从1957年11月到2002年从未间断，成为上海市民生活变化的印证。账本记载：1980年夫妇俩全年的总收入
某蛋白质分子含有a条肽链，共有b个氨基酸组成。如果氨基酸的平均相对分子质量是c，则该蛋白质的相对分子质量以及水解时需要的水的相对分子质量
— Andrew won’t like it, you know. — ______ — I don’t care what Andrew thinks! A. Why not? B. What for? C. How come?
When the big bills for mother's hospital care came, father was glad he had money in the bank to _____. A. fall short of B. fall through C. fall back on D. fall in with
，则
( ) 
B. 
C.
D. 
,故选C.